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MHT CET Physics question

PhysicsDual Nature of Matter and RadiationMHT CET

When light of wavelength is incident on photosensitive surface, the stopping potential is . When light of wavelength is incident on same surface, the stopping potential is . Threshold wavelength of the surface is [MHTCET 2016]

Answer: (D)

Solution

and ; subtracting, , so

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Question ID VK-083712